Notes

2013-06-19: The vertical datum of the 1998 TWDB rating curve for Lake Graham has been adjusted from NGVD29 to NGVD29+1.3ft.

Lake Graham: 78.9% full as of 2022-11-27

The elevation-storage rating curve used to produce the storage hydrograph is made of two segments: (1) the segment up to the conservation pool top (below the red line) is based on measured data, and (2) the segment in the flood pool (above the red line) is an extrapolation from the first segment and shouldn't be relied upon for flood storage information.

Historical Data

Date Percent Full Mean Water Level
(ft)
Reservoir Storage
(acre-ft)
Conservation Storage
(acre-ft)
Conservation Capacity
(acre-ft)
Surface Area
(acres)
Most recent 2022-11-27 78.9 1,070.91 35,754 35,740 45,288 2,164
1 day prior 2022-11-26 78.8 1,070.88 35,689 35,675 45,288 2,162
2 days prior 2022-11-25 78.3 1,070.78 35,473 35,459 45,288 2,155
1 week prior 2022-11-20 78.4 1,070.80 35,516 35,502 45,288 2,156
1 month prior 2022-10-27 78.9 1,070.90 35,732 35,718 45,288 2,163
3 months prior 2022-08-27 84.4 1,072.03 38,255 38,241 45,288 2,240
6 months prior 2022-05-27 93.6 1,073.80 42,382 42,368 45,288 2,362
1 year prior 2021-11-27 87.9 1,072.72 39,838 39,824 45,288 2,288
*

Percent Full is based on Conservation Storage and Conservation Capacity and doesn't account for storage in flood pool.

**

   Values above, including today's are averaged conditions. For near real-time instantaneous water level, see table below or the interactive map viewer.

Most Recent Instantaneous Water Level

Date/time Water Level
(ft)
Conservation Pool Elevation
(ft)
Height Above Conservation Pool
(ft)
Most recent 2022-11-28 01:00 1,070.91 1,075.00 -4.09
1 hour prior 2022-11-28 00:00 1,070.91 1,075.00 -4.09
2 hours prior 2022-11-27 23:00 1,070.91 1,075.00 -4.09
6 hours prior 2022-11-27 19:00 1,070.91 1,075.00 -4.09
12 hours prior 2022-11-27 13:00 1,070.92 1,075.00 -4.08
24 hours prior 2022-11-27 01:00 1,070.91 1,075.00 -4.09
48 hours prior 2022-11-26 01:00 1,070.78 1,075.00 -4.22
*

Data is provisional and subject to revision.

Additional Information

Impoundment date 1958-01-01
Gauge USGS:08088400
Vertical datum NGVD29 +1.3
Dead pool elevation 1,030.00 ft above NGVD29 +1.3
Service spillway crest elevation 1,076.30 ft above NGVD29
Top of dam elevation 1,093.30 ft above NGVD29
Conservation pool elevation 1,075.00 ft above NGVD29 +1.3
Data download (CSV) period of record, last one year, last 30 days

Elevation-Area-Capacity Curves

1958-01-01 (source: USGS)
1998-04-01 (source: TWDB) : GIS Data

Lake Location